how to calculate ffu quantity

the clean room has different air change times according different class. basically, when the cleanroom(clean booth) height less than 4.0m, class 1000 clean room’ s air change times is 50-60,10000class is 15-25times .
if you want to set up a booth (1000class): area is 15 square meter , height is 2.8m .the calculate method as following :
room volume: 15*2.8=42 cube meter
total air volume: 42*60=2520 cube meter
ffu air volume: 1175*575 is 900cmh
ffu quantity : 2520/900=3 sets

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